Pivot-beabiug



FRANcIs o. Low'rHoRP, or TRENTON, Naw "pf ,y l

`rrvo'r Barrantes Specification of Letters Patent No. 26,689, datedJanuary To all whom 'it may concern:

Be it known that I, FRANCIS C. `Low- THoRP, of Trenton, Mercer county,New Jersey,` have invented a new and Improved Pivot-Bearing forTurn-Tables, &c.;and I do hereby declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawing and to the letters of reference marked thereon. l

My invention consists in interposing between a plate attached to aturntable, swing bridge or other like object, and the foundation platefor the same, a pivot constructed and arranged in respect to the twoplates substantially as described hereafter, soas to form a center onwhich the bridge or other object can roll and balance itselfand so as topresent in contact with the foundation plate a self lubricating surface.i

In order to enable others to make and use my invention I will nowproceed to describe its construction and operation. y

On reference to the accompanying drawing, which forms a part of thisspecification, Figure l is an exterior View of my'improved pivotbearing; Fig. 2, a vertical section `of the same; Fig. 3, a plan of thestep or socket with the pivot removed, and Fig. 4, aninverted plan viewof the pivot.'

Similar letters refer to similar parts throughout the several views. i

A represents the stationary step or socket, B the pivot and C the uppersocket or. cap of my improved pivot bearing, which is illustrated in thedrawingas arranged for use under a swin bridge or turntable.

In the undersi e of the capC is a concave recess which lits overtheupper portion of the pivot B,.this portion of the pivot beingsomewhat smaller in diameter than the re` cess, and the concavity of thelatter` being somewhat less abrupt than the conveXity of the top of thepivot. The object of this arrangement is in order that the bridge `orturn-table to which the cap C issecured may be atliberty to rollslightly and balance and adjust itself on thepivot. i i

The lower portion of the pivot B .its into a recess in the stationarystep A the bearing "surface ofthe pivot on the bottom of the recessbeing level, and the pivot being so formed as to leave an annularchamber a within the recess of the step. This chamber communicatesthrough transverse grooves `the cap and the stepbutkfree; from` contactltable, swing bridge or lotherflike object,an`df y balance itself, and so1as tof presentinicon#` c c in the bottom `ofgthepivot and similar"grooves h h on thevbottornfofdthe recess,fwith f the central chambers y`and d the l former jbeing in the pivotandfthelatterinthebottom3 of therecess ofthe step. l "Tlf The pivot has a flange lmisituatedbetweenfwith both, the fiangefserving the purpose of preventing dust and`dirt"fromgaining `ac-f` y cess to the recessof thestep.` `Additional`@j protection maybe affordedfby `a band z" of p g leather orothersuitable material applied tof the liange `m and to theprojectingportion of` the step in the manner illustrated in lred linesFig. 2. 1 j I 1" Oil is poured into the chamber alsoasto@l nearly fillthe latter land the `clnimbers I,b so that as the pivotturnson the.stepthe frictional surface isl always eiciently lubrif, "l cated therefuseandldirt caused bythe wear V i ing of the surfaceormixed with the`oilbeing l conveyed bythe transverse rooves c andi; `1` 1` to thecentral chamber inilw ichit becomes MI depositedat a safedistancefromthe b`earing surface. `1 y i 3 i 2 l80`1 The bearingIsurface of` the cap on` the.` l p pivot being unlubricated the pivotwill of 1i" course turnwith thecapyat` the same time` f owing to theabove `described smanner of` adapting the cap to the pivot the former,`istV at liberty to roll and adjust itself `onthe latter. i l; l l" @Si Aloose disk or disks" offantifrictionmetal` may be advantageously"applied between the t 1p pivot and the step. f y i `1 l ff Iclaim asmyinvention and desire to Se-` l 1 cure by Letters Patent- "l k iInterposing between theplate Gfof a turn;

the step or foundation plate";A,` a, pivot Bg" constructed and arrangedin `respect` to the plates substantially `as 4hereinloefore i def;scribed so as to form acenter on"whichthe object connected to the plateC mayrollrand tact with the plate A a selfflubricatingsui face. u i y, lp

In testimony whereof, I gihavesignedfmy name to this specificationinthepresence of t,

HENRY IIowsolg,` t p

